Gear ring closed forging die with fillet flange

Abstract

The utility model relates to the technical field of gear ring machining, in particular to a closed forging die for a gear ring with a fillet flange, which comprises a lower die holder, a lower male die, a female die, an upper male die and an upper die holder. The lower male die is connected to the lower die base in the direction facing the upper die base. The upper male die is connected to the upper die base in the direction facing the lower male die. The female die is elastically connected to the upper die base and located on the side, closer to the lower die base, of the upper male die. According to the closed forging die, the female die is matched with the lower male die, the gear ring to be forged forms the gear ring with the fillet flange, the flange of the gear ring is located at the lower end, insufficient filling can be avoided, meanwhile, due to the fact that metal can be in smooth transition at the flange in the forging forming process, stress concentration is avoided, and in addition, the service life of the gear ring is prolonged. And a product can be quickly ejected out after being formed through the push rod component, so that the demolding difficulty is reduced, and the precision and durability of a workpiece are also improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of gear ring machining, in particular to the gear ring closed forging die containing the fillet flange. BACKGROUND

[0002] Gear ring is an important element to realize efficient and stable transmission, and is usually installed on the inner side of the gear reducer. Its role is to realize mechanical transmission through cooperation with planetary gear, sun gear, planet carrier and the like. The inner gear ring has high torque and axial load capacity, and is usually used in heavy load, high torque industrial machinery, such as mechanical arm, rotary platform and industrial robot and the like.

[0003] With the increasing requirements of mechanical and automobile industry on transmission components, the forging technology of gear ring is also increasingly improved. The machining process of traditional gear ring is mainly turning, which has low material utilization rate and low machining efficiency, and is difficult to meet the mass production and high precision requirements of industrial production. The forging process improves the precision, surface quality and material utilization rate of the gear ring through die forming, and the use of closed forging also greatly reduces the generation of burrs. The design of the flange with a fillet avoids the stress concentration problem, helps to improve the forming precision, reduce the subsequent processing amount, and improve the overall durability of the gear ring, but how to ensure the forming effect of the flange and its fillet is still a technical difficulty. SUMMARY

[0004] In view of the technical problems existing in the forging die in the prior art, the first aspect of the utility model provides a gear ring closed forging die containing a fillet flange, which comprises a lower die seat, a lower punch, a concave die, an upper punch and an upper die seat;

[0005] The lower punch is connected to the lower die seat in the direction of the upper die seat;

[0006] The upper punch is connected to the upper die seat in the direction of the lower punch;

[0007] The concave die is elastically connected to the upper die seat and located on the side of the upper punch closer to the lower die seat;

[0008] When the lower die seat and the upper die seat are closed, a closed die cavity is formed between the concave die, the lower punch and the upper punch for processing and forming the gear ring to be forged in the die cavity;

[0009] Wherein, the push rod component is connected to the lower die seat, the push rod component is in sliding connection with the lower die seat, when the lower die seat and the upper die seat are opened, the upper punch and the concave die are separated from the forged gear ring first, the push rod component is used to push the forged gear ring outside the lower punch in the opening direction, so that the forged gear ring and the lower punch are separated.

[0010] Preferably, the lower punch comprises a forming part and a base, the forming part is configured as a columnar structure with a toothed portion on the outer wall, and the base is configured as a disc-shaped structure, and an upper end surface of the base forms a supporting surface for supporting an end surface of the forged gear ring.

[0011] Preferably, the lower punch comprises a forming part and a base, the forming part is configured as a columnar structure with a toothed portion on the outer wall, and the base is configured as a disc-shaped structure, and an upper end surface of the base forms a supporting surface for supporting an end surface of the forged gear ring.

[0012] Preferably, the lower punch comprises a forming part and a base, the forming part is configured as a columnar structure with a toothed portion on the outer wall, and the base is configured as a disc-shaped structure, and an upper end surface of the base forms a supporting surface for supporting an end surface of the forged gear ring.

[0013] Preferably, the lower punch comprises a forming part and a base, the forming part is configured as a columnar structure with a toothed portion on the outer wall, and the base is configured as a disc-shaped structure, and an upper end surface of the base forms a supporting surface for supporting an end surface of the forged gear ring.

[0014] Preferably, the lower punch comprises a forming part and a base, the forming part is configured as a columnar structure with a toothed portion on the outer wall, and the base is configured as a disc-shaped structure, and an upper end surface of the base forms a supporting surface for supporting an end surface of the forged gear ring.

[0015] Preferably, the lower punch comprises a forming part and a base, the forming part is configured as a columnar structure with a toothed portion on the outer wall, and the base is configured as a disc-shaped structure, and an upper end surface of the base forms a supporting surface for supporting an end surface of the forged gear ring.

[0016] Preferably, the lower punch comprises a forming part and a base, the forming part is configured as a columnar structure with a toothed portion on the outer wall, and the base is configured as a disc-shaped structure, and an upper end surface of the base forms a supporting surface for supporting an end surface of the forged gear ring.

[0017] Preferably, the lower punch comprises a forming part and a base, the forming part is configured as a columnar structure with a toothed portion on the outer wall, and the base is configured as a disc-shaped structure, and an upper end surface of the base forms a supporting surface for supporting an end surface of the forged gear ring.

[0018] Preferably, the lower punch comprises a forming part and a base, the forming part is configured as a columnar structure with a toothed portion on the outer wall, and the base is configured as a disc-shaped structure, and an upper end surface of the base forms a supporting surface for supporting an end surface of the forged gear ring.

[0019] Compared with the prior art, the utility model has the advantages that:

[0020] The concave die and the lower convex die of the closed forging die are matched, so that the to-be-forged gear ring forms a gear ring with a fillet flange, the flange of the gear ring is at the lower end, filling is avoided, and the metal can smoothly transition at the flange part in the forging forming process, stress concentration is avoided, in addition, the product can be quickly ejected after forming through the push rod part, the demolding difficulty is reduced, and the precision and durability of the workpiece are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures can be represented by a like numeral. For purposes of clarity, not every component can be called out in every drawing. There is now being described by way of example various embodiments of aspects of the present utility model, with reference to the accompanying drawings in which:

[0022] Figure 1 is a schematic view of the closed forging die for the gear ring with a fillet flange in a closed die state shown in the present utility model;

[0023] Figure 2 is a schematic view of the closed forging die for the gear ring with a fillet flange in an open die state shown in the present utility model;

[0024] Figure 3 is a schematic view of the gear ring being ejected after forging shown in the present utility model;

[0025] Figure 4 is a schematic view of the structure of the lower convex die shown in the present utility model;

[0026] Figure 5 is a top view of the lower convex die shown in the present utility model. DETAILED DESCRIPTION

[0027] In order to better understand the technical content of the present utility model, specific embodiments are described below in combination with the accompanying drawings.

[0028] In combination with Figure 1 and Figure 2 shown, the present utility model proposes a closed forging die for a gear ring with a fillet flange, which comprises a lower die seat 100, a lower convex die 200, a concave die 300, an upper convex die 600 and an upper die seat 500.

[0029] The lower convex die 200 is connected to the lower die seat 100 towards the direction of the upper die seat 500, the upper convex die 600 is connected to the upper die seat 500 towards the direction of the lower convex die 200, the concave die 300 is elastically connected to the upper die seat 500 and is located on the side of the upper convex die 600 closer to the lower die seat 100.

[0030] In optional embodiments, a plurality of guide rods 13 are arranged on the lower die seat 100, and a plurality of guide sleeves 55 are arranged on the upper die seat 500. When the mold is closed, the guide rods 13 are inserted into the guide sleeves 55.

[0031] Further, a push rod component is connected to the lower die seat 100, and the push rod component is in sliding connection with the lower die seat 100.

[0032] Thus, when the lower die seat 100 and the upper die seat 500 are closed, a closed mold cavity is formed between the concave die 300, the lower punch 200, and the upper punch 600, for processing the to-be-forged gear ring in the mold cavity into a predetermined shape.

[0033] Specifically, when the mold is closed, the concave die 300 first contacts the lower punch fixed plate 102, so that an open mold cavity is formed between the concave die 300 and the lower punch 200. As the mold continues to close, the elastic element between the concave die 300 and the upper die seat 500 is compressed, the upper punch 600 contacts the lower punch 200, the mold cavity is closed, and the material in the mold cavity is forged into a predetermined shape of the gear ring.

[0034] In order to make the to-be-forged gear ring have a predetermined shape.

[0035] In combination with Figure 4 and Figure 5 As shown, the lower punch 200 includes a forming portion 201 and a base 202. The forming portion 201 is configured as a columnar structure with a tooth portion on the outer wall. The base 202 is configured as a disc structure. An upper end surface of the base 202 forms a bearing surface for bearing an end surface of the forged gear ring.

[0036] Thus, the bottom flange of the to-be-forged gear ring is limited by the base 202, and the inner tooth structure is formed by the forming portion 201.

[0037] In combination with Figure 1 and Figure 2 As shown, the concave die 300 is configured as a disc structure. A wall surface of the concave die 300 that is in contact with the to-be-forged gear ring is configured to include at least a circular-arc-shaped wall surface, for making the to-be-forged gear ring form a circular-angled flange.

[0038] Thus, when the mold is closed, the outer side of the to-be-forged gear ring is formed into a predetermined contour by the inner wall contour of the concave die 300, especially a flange structure with a circular angle.

[0039] In optional embodiments, the lower end surface of the upper punch 600 is arranged to be engaged with the upper end surface of the lower punch 200, and the upper punch 600 can extend into the insertion hole of the concave die 300 and be in contact with the inner wall of the concave die 300.

[0040] Thus, when the mold is closed, the lower end surface of the upper punch 600 moves downward until it is in contact with the upper end of the to-be-forged gear ring, so that the to-be-forged gear ring is formed. Thus, when the mold is closed, the lower end surface of the upper punch 600 moves downward until it is in contact with the upper end of the to-be-forged gear ring, so that the to-be-forged gear ring is formed.

[0041] Because in the forming process, the flange of the forging and the tooth shape of the gear ring are highly attached in the mold due to the characteristics of closed forging, it is difficult to demold after forming, therefore, the push rod part is used for rapid demolding.

[0042] Specifically, when the lower die holder 100 and the upper die holder 500 are demolded, the upper punch 600 is first separated from the forged gear ring, and then separated from the forged gear ring after the recessed die 300 is reset, and then the forged gear ring outside the lower punch 200 is pushed out along the demolding direction by the push rod part, so that the forged gear ring and the lower punch 200 are separated.

[0043] In a specific embodiment, a blank made of AISI-1045 steel material is used, the pretreated steel blank is heated to a plastic state at 800°C and placed in the mold, and the forming is started by the action of the hydraulic machine, the mold temperature is set to 400°C, the descending speed of the upper die holder 500 is 10 mm / s, and the friction coefficient is 0.25, so as to ensure that the metal flows sufficiently in the recessed die 300 and achieves the best filling effect.

[0044] After the forging is completed, the push rod part quickly pushes out the finished product, the demolding time can be reduced to about 0.8 seconds, the sticking of the mold caused by cooling shrinkage is avoided, the mold structure can remain stable under a load of 7328kN, the round corner design of the flange part reduces stress concentration phenomenon, and the precision and durability of the workpiece are improved.

[0045] In combination Figure 3 As shown, the push rod part includes a push rod 410 and a top rod 420, the top rod 420 is fixed to one side of the push rod 410 close to the lower punch 200, and the push rod 410 is in sliding connection with the backing plate 101.

[0046] Among them, the base 202 is provided with a plurality of insertion holes 203 corresponding to the top rods 420, and the top rods 420 can pass through the insertion holes 203 to push the forged gear ring above the base 202 out along the demolding direction.

[0047] In this way, by controlling the upward movement of the push rod 410, the plurality of top rods 420 can pass through the insertion holes 203 to push out the forged gear ring, and by the cooperation of the push rod 410 and the backing plate 101, the cooperation of the top rod 420 and the insertion hole 203, the accuracy of the ejection direction can be ensured.

[0048] In an optional embodiment, the lower punch backing plate 101 and the lower punch fixed plate 102 are sequentially arranged above the lower die holder 100, the base 202 of the lower punch 200 is between the lower punch fixed plate 102 and the backing plate 101, and the forming part 201 of the lower punch 200 extends above the lower punch fixed plate 102.

[0049] In combination Figure 1 and Figure 2As shown, the lower punch 200 is connected with the first guide rod 11 and the first pull rod 12 extending towards the die seat 500, the first guide rod 11 passes through the lower die seat 100, the lower punch pad plate 101 and the lower punch fixed plate 102 in sequence, the first end of the first pull rod 12 is connected to the lower die seat 100, and the second end is connected to the lower punch fixed plate 102, so that the lower die seat 100, the lower punch pad plate 101 and the lower punch fixed plate 102 are fixed to each other.

[0050] In this way, by arranging the first guide rod 11, the lower die seat 100, the lower punch pad plate 101 and the lower punch fixed plate 102 are assembled together, and the positions of the remaining positioning holes are ensured to correspond, and then the first pull rod 12 is used to fix the lower die seat 100, the lower punch pad plate 101 and the lower punch fixed plate 102 as a whole.

[0051] In combination Figure 1 and Figure 2 As shown, the lower punch 200 is connected with the first guide rod 11 and the first pull rod 12 extending towards the die seat 500, the first guide rod 11 passes through the lower die seat 100, the lower punch pad plate 101 and the lower punch fixed plate 102 in sequence, the first end of the first pull rod 12 is connected to the lower die seat 100, and the second end is connected to the lower punch fixed plate 102, so that the lower die seat 100, the lower punch pad plate 101 and the lower punch fixed plate 102 are fixed to each other.

[0052] Specifically, the upper punch 600 is fixed to the upper punch fixed plate 502 through the second screw 54, the connecting rod 53 passes through the upper punch fixed plate 502, the limiting structure 531 at the upper end makes the connecting rod 53 unable to be separated from the upper punch fixed plate 502, the nut 533 at the bottom end fixes the concave die 300 and the connecting rod 53 together, the spring 532 is between the concave die 300 and the upper punch fixed plate 502, and the concave die 300 and the upper punch fixed plate 502 have the maximum distance and only approach each other when the mold is closed.

[0053] In an optional embodiment, the upper die seat 500 is connected with the second guide rod 51 and the first screw 52 extending towards the lower die seat 100, and the first screw 52 is used to fix the upper die seat 500, the upper punch pad plate 501 and the upper punch fixed plate 502 to each other.

[0054] In this way, by arranging the second guide rod 51, the upper die seat 500, the upper punch pad plate 501 and the upper punch fixed plate 502 are assembled together, and then the first screw 52 is used to fix the upper die seat 500, the upper punch pad plate 501 and the upper punch fixed plate 502 to each other.

[0055] In combination with the above embodiment, the concave die and the lower convex die of the closed forging die are matched, so that the to-be-forged gear ring forms a gear ring with a fillet flange, and the flange of the gear ring is at the lower end, thereby avoiding underfilling, and meanwhile, due to the smooth transition of the metal at the flange part in the forging forming process, stress concentration is avoided, in addition, the product can be quickly ejected after forming through the push rod component, the demolding difficulty is reduced, and the precision and durability of the workpiece are also improved.

[0056] Although the utility model has disclosed as above with preferred embodiment, it is not used to limit the utility model. Those skilled in the art to which the utility model belongs can make various changes and decorations without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be defined by the claims.

Claims

1. A closed-die forging die for a gear ring with a rounded flange, characterized in that, The lower die base (100), the lower punch (200), the concave die (300), the upper punch (600) and the upper die base (500) are included. The lower punch (200) is connected to the lower die base (100) towards the upper die base (500). The upper punch (600) is connected to the upper die base (500) towards the lower punch (200). The concave die (300) is elastically connected to the upper die base (500) and is located on the side of the upper punch (600) closer to the lower die base (100). When the lower die base (100) and the upper die base (500) are closed, a closed die cavity is formed between the concave die (300), the lower punch (200) and the upper punch (600) for processing the forged gear ring in the die cavity. The push rod part is connected to the lower die base (100) and is in sliding connection with the lower die base (100). When the lower die base (100) and the upper die base (500) are opened, the upper punch (600) and the concave die (300) are separated from the forged gear ring first, and the push rod part is used to push the forged gear ring outside the lower punch (200) in the opening direction, so that the forged gear ring is separated from the lower punch (200).

2. The radiused-flanged ring closure swage of claim 1, wherein, The lower punch (200) includes a forming part (201) and a base (202). The forming part (201) is configured as a columnar structure with a tooth part on the outer wall. The base (202) is configured as a disc type structure. The upper end surface of the base (202) forms a bearing surface for bearing the end surface of the forged gear ring.

3. The radiused-flanged gear ring obturator forging die of claim 1 wherein, The concave die (300) is configured as a disc type structure. The wall surface of the concave die (300) in contact with the forged gear ring is configured to include at least a circular arc wall surface, so as to form a fillet flange on the forged gear ring.

4. The radiused-flanged gear ring obturator forging die of claim 1 wherein, The lower end surface of the upper punch (600) is arranged to engage with the upper end surface of the lower punch (200), and the upper punch (600) can extend into the insertion hole of the concave die (300) and be in contact with the inner wall of the concave die (300).

5. The radiused-flanged gear ring obturator forging die of claim 1 wherein, The lower die base (100) is sequentially provided with a base plate (101) and a lower punch fixing plate (102) above. The base (202) of the lower punch (200) is located between the lower punch fixing plate (102) and the base plate (101). The forming part (201) of the lower punch (200) extends above the lower punch fixing plate (102).

6. The radiused-flanged gear ring swage die of claim 5 wherein, The first guide rod (11) and the first pull rod (12) are connected to the lower punch (200) and extend towards the upper die base (500). The first guide rod (11) sequentially passes through the lower die base (100), the base plate (101) and the lower punch fixing plate (102). The first end of the first pull rod (12) is connected to the lower die base (100), and the second end is connected to the lower punch fixing plate (102), so as to fix the lower die base (100), the base plate (101) and the lower punch fixing plate (102) to each other.

7. The radiused-flanged gear ring obturator forging die of claim 1 wherein, The upper die seat (500) is sequentially connected with an upper punch pad (501) and an upper punch fixing plate (502) from bottom to top, the upper punch (600) is connected to the upper punch fixing plate (502), the concave die (300) is connected to the upper punch fixing plate (502) through a connecting rod (53), a spring (532) is arranged between the concave die (300) and the upper punch fixing plate (502), and the connecting rod (53) is used for limiting the maximum distance between the upper punch fixing plate (502) and the upper punch fixing plate (502).

8. The radiused-flanged gear ring swage die of claim 7, wherein, The upper die seat (500) is connected with a second guide rod (51) and a first screw (52) extending towards the lower die seat (100), and the first screw (52) is used for fixing the upper die seat (500), the upper punch pad (501) and the upper punch fixing plate (502) to each other.

9. The radiused-flanged gear ring swage die of claim 5 or 6, wherein, The push rod component comprises a push rod (410) and a top rod (420), the top rod (420) is fixed to one side of the push rod (410) close to the lower punch (200), and the push rod (410) is in sliding connection with the pad (101).

10. The radiused-flanged gear ring swage die of claim 9, wherein, The base (202) is provided with a jack (203) corresponding to the top rod (420), and the top rod (420) can pass through the jack (203) to push the forged gear ring above the base (202) out in the demolding direction.

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